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LTC1410CG Datasheet(PDF) 8 Page - Linear Technology |
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LTC1410CG Datasheet(HTML) 8 Page - Linear Technology |
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8 / 16 page  8 LTC1410 APPLICATIONS INFORMATION DYNAMIC PERFORMANCE The LTC1410 has excellent high speed sampling capabil- ity. Fast Four Transform (FFT) test techniques are used to test the ADC’s frequency response, distortion and noise at the rated throughput. By applying a low distortion sine wave and analyzing the digital output using an FFT algo- rithm, the ADC’s spectral content can be examined for frequencies outside the fundamental. FREQUENCY (kHz) 0 0 –20 –40 –60 –80 –100 –120 100 200 300 400 1410 F02a 500 600 fSAMPLE = 1.25MHz fIN = 100.098kHz SFDR = 90.1dB SINAD = 72.4dB FREQUENCY (kHz) 0 0 –20 –40 –60 –80 –100 –120 100 200 300 400 1410 F02b 500 600 fSAMPLE = 1.25MHz fIN = 599.975kHz SFDR = 84.7dB SINAD = 71.7dB Figure 2b. LTC1410 Nonaveraged 4096 Point FFT, 600kHz Input Figure 2a. LTC1410 Nonaveraged 4096 Point FFT, 100kHz Input to frequencies from above DC and below half the sampling frequency. Figures 2a and 2b shows a typical spectral content with a 1.25MHz sampling rate for 100kHz and 600kHz inputs. The dynamic performance is excellent for input frequencies up to the Nyquist limit of 625kHz and beyond. Effective Number of Bits The Effective Number of Bits (ENOBs) is a measurement of the resolution of an ADC and is directly related to the S/(N + D) by the equation: N = [S/(N + D) – 1.76] /6.02 where N is the effective number of bits of resolution and S/(N + D) is expressed in dB. At the maximum sampling rate of 1.25MHz the LTC1410 maintains very good ENOBs up to the Nyquist input frequency of 625kHz and beyond. Refer to Figure 3. Signal-to-Noise Ratio The Signal-to-Noise plus Distortion ratio [S/(N + D)] is the ratio between the RMS amplitude of the fundamental input frequency to the RMS amplitude of all other frequency components at the ADC output. The output is band limited INPUT FREQUENCY (Hz) 2 4 6 8 10 10k 100k 1M 10M LTC1410 • TA02 0 1k 12 74 68 62 56 50 fSAMPLE = 1.25MHz NYQUIST Figure 3. Effective Bits and Signal/(Noise + Distortion) vs Input Frequency Total Harmonic Distortion (THD) Total harmonic distortion is the ratio of the RMS sum of all harmonics of the input signal to the fundamental itself. The out-of-band harmonics alias into the frequency band between DC and half the sampling frequency. THD is expressed as: THD VV = +++ 20 3 2 4 2 log V . . .V V 2 2 n 2 1 |
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